Lei Jun, founder and CEO of China's mobile company Xiaomi, speaks at a launch ceremony of Xiaomi Phone 4, in Beijing, July 22, 2014. China's Xiaomi unveiled on Tuesday its new flagship Mi 4 smartphone, aimed squarely at the premium handset market dominated by Apple Inc and Samsung Electronics Co Ltd. 6 Plus, there were rumours that both the handset will come equipped with sapphire displays, but it did not come true.